4 = 20 Packs with chip Compatible Cartridges CANON PGI520BK CLI521BK + + + CLI521C CLI521M + CLI521Y for printers Canon Pixma IP3600 / IP4600 Pixma / IP4700 / Pixma MP980 / MP630 / MP620 / MP540 / MP560 / MP550 / MP640 / MP980 / MP990 - ( Silve ... 4 packs 20 ink cartridges canon printer pixma 550-compatible chip that I bought 14/01 / 2012.Je is perfect.